Tellstick pairing Elro AB440WD

[Sir John]

Hallo,

I am a complete newbie on Home Automation.
I purchased an old second-hand Tellstick just to play around.

I managed to pair an Elro AB440WD (which I already owned) without any difficulty.
I then removed the connection from within the software.

I can however no longer access the switch with the remote control - which was already in use.
The switch seems to still be paired to the Tellstick.
Any idea how I remove it ?

Many Thanks.